Answer:
Feed me and I live, give me drink and I die.
how many words are in those books
What has 3 feet but cannot walk?
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
Three lives have I. Gentle enough to soothe the skin. Light enough to caress the sky. Hard enough to crack rocks.
You use it between your head and your toes, the more it works the thinner it grows.